I booked a flight from MIA to SXM . Yesterday there was an aircraft change and a time change. No big deal. Time change only 10 minutes. We had two aisle seats close to the front. Now we have two aisle seat one aisle from the back of the aircraft. When I go to change seats, there are no seat open to change to. However when I go to book the flight normally many seats are still available. Hopefully in a day or two I can get closer to the front.